1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dimulka [17.4K]
2 years ago
15

A stone of mass m = 1.05 kg is released from a height of h = 2.1 m into a pool of water. At a time of t = 1.83 s after hitting t

he surface of the water, the stone's velocity has decreased by 50%.
What is the magnitude of the average force the stone experiences, in newtons, during the time t?
Physics
1 answer:
mote1985 [20]2 years ago
7 0

Answer:

Explanation:

ignoring air resistance, the kinetic energy at water impact will equal the potential energy converted

½mv² = mgh

v = √(2gh)

v = √(2(9.81)2.1) = 6.4188... m/s

after impact, an impulse will result in a change of momentum.

There is a downward impulse due to gravity equal to the weight of the stone and an upward average force due to water resistance and buoyancy force.

FΔt = mΔv

(F - mg)Δt = m(vf - vi)

(F - mg) = m(vf - vi)/Δt

F = m(vf - vi)/Δt + mg

F = m((vf - vi)/Δt + g)

F = 1.05(((½(-6.4188) - -6.4188)/ 1.83) + 9.81)

F = 12.14198...

F = 12.1 N

You might be interested in
What's Inertia ????☁️☁️​
Assoli18 [71]

Explanation:

the inability to change the position from rest to motion or motion to rest by themselves is inertia.

3 0
3 years ago
Ted Clubber Lang. A hook in boxing primarily involves horizontal flexion of the shoulder while maintaining a constant angle at t
il63 [147K]

Answer:

15 m/s or 1500 cm/s

Explanation:

Given that

Speed of the shoulder, v(h) = 75 cm/s = 0.75 m/s

Distance moved during the hook, d(h) = 5 cm = 0.05 m

Distance moved by the fist, d(f) = 100 cm = 1 m

Average speed of the fist during the hook, v(f) = ? cm/s = m/s

This can be solved by a very simple relation.

d(f) / d(h) = v(f) / v(h)

v(f) = [d(f) * v(h)] / d(h)

v(f) = (1 * 0.75) / 0.05

v(f) = 0.75 / 0.05

v(f) = 15 m/s

Therefore, the average speed of the fist during the hook is 15 m/s or 1500 cm/s

6 0
3 years ago
A marble is placed at the bottom of a semi-spherical bowl, as shown in the figure. The marble is then displaced from the bottom
Andrew [12]

Answer:

It is D

Explanation:

8 0
3 years ago
Calculate the speed of a car that traveled 200 kilometers in 3 hours.
nignag [31]

Answer:

The units (km/h) tell you how to do this! 200km/3h = 66.66666666…. BUT technically you only have ONE significant digit: 3 so 66.666… rounded to ONE digit is 70km/h but that is probably not important in this intro class so V = 66.67 or 67 km/h

8 0
2 years ago
Read 2 more answers
Select the correct answer from the drop-down menu. anne applies a force on a toy car and makes it move forward. what can be said
nalin [4]

Answer:

The forces could be gravity, friction between the car and the ground, the force Katie is applying and the normal reaction.

6 0
1 year ago
Other questions:
  • 2. The Himalayas in central Asia are the tallest mountains in the world. But fossils of seashells can be found high in these mou
    13·1 answer
  • Kiko writes a roport to compare and contrast the code of plants and animals. Which of the following statements is accurato arvd
    7·1 answer
  • P7.36 A ship is 125 m long and has a wetted area of 3500 m2. Its propellers can deliver a maximum power of 1.1 MW to seawater at
    15·1 answer
  • The image of the lemon is at point I. What is the size of the image compared to the size of the lemon?
    8·2 answers
  • A 57 g tennis ball is traveling at 45 m/s to the right
    12·1 answer
  • A steel cable of diameter 3.0 cm supports a load of 2.0kN. What is the fractional length increase of the cable compared with the
    11·1 answer
  • What is the surface pressure of Venus?
    13·1 answer
  • What is the force on a 250 kg elevator that is falling freely at 9.8 m/sec2?​
    8·2 answers
  • Explain the concept of energy conversion as applied to the generation of electricity also known as electrical energy.​
    9·1 answer
  • Please please help me
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!